Which of the following is the bronsted-lowry definition of an acid?

The theroy is that acid is a proton(hydrogen ion)donor and a base is a proton (hydrogen ion) acceptor

The hydrogen on the hydrogen chloride donates its hydrogen proton to the water, resulting in a cation of H3O+ and an anion of Cl-. HCl + H2O = H3O+ + Cl-. In contrast to the acid definition, a Bronsted-Lowry base is a substance that accepts protons. An example of a proton acceptor is ammonia (NH3).

so ur answer is proton (H+) donor

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is